US Bridges

Road 603 over Willow Creek

Fair

Madera County, California · 0.2 MI W RD 407 · Structure no. 41C0185

Built
1974
51 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
61 ft
2 main spans
Daily traffic
100
1980 count
Owner
County
County Highway Agency

About this bridge

Road 603 over Willow Creek is a concrete continuous slab carrying Road 603 over Willow Creek in Madera County, California. It was built in 1974, so it is 51 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 100 vehicles a day, roughly 7% of them trucks, projected to reach 191 by 2042. The structure is 61 ft (18.6 m) long and 37 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesRoad 603
CrossesWillow Creek
Location0.2 MI W RD 407
RouteCounty Highway 0
CountyMadera County
StateCalifornia
Coordinates37.10596, -119.89404
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating62.5 US tons
Inventory rating37.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length61 ft (18.6 m)
Longest span28 ft (8.5 m)
Deck width37 ft (11.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (1980)
Projected traffic191 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road 603 over Willow Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is Road 603 over Willow Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does Road 603 over Willow Creek carry?

About 100 vehicles per day (1980 count), of which roughly 7% are trucks.

How long is Road 603 over Willow Creek?

The structure is 61 ft (18.6 m) long with a longest span of 28 ft (8.5 m) and a deck 37 ft wide.

Who owns Road 603 over Willow Creek?

It is owned by the County Highway Agency.